Rubbin but not Dubbin

Ok, so I'm running standard suspension on my 2012 S3 with 12mm spacers on the rear and even with the arch screw removed, I still rub. That's without anyone in the rear too. Wouldn't dare put anyone in the back! There's a build up of rubber around the tyre now.
Thinking about swapping my front 10mm to the rear but I'm not sure if it'll look daft.
Would fitting stiffer H&R springs stop this?
Or switching to stretched tyres next time?
Or maybe brand of tyre might help if the tread pattern is different at the top of the side wall?

I know spacers is a well covered topic but I thought I'd be safe from chub rub when I bought them.

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